[Prolactin-releasing peptide increases rat anxiety].

Area of Science:

• Neuroscience
• Behavioral Endocrinology

Background:

• Prolactin-releasing peptide (Prl-RP) influences prolactin production and interacts with the central nervous system.
• Prl-RP's role in modulating behavior, particularly anxiety, remains largely unexplored in scientific literature.

Purpose of the Study:

• To investigate the anxiogenic effects of Prl-RP in a rodent model.
• To determine if Prl-RP administration alters anxiety-related behaviors in white Wistar rats.

Main Methods:

• Anxiety levels were assessed using the elevated plus-maze (EPM) and a social preference test.
• Behavioral parameters recorded included time in open arms (EPM), edge reactions (EPM), and social interaction time.

Main Results:

• Intranasal administration of Prl-RP decreased time in open arms and edge reactions in the EPM, suggesting increased anxiety.
• In the social preference test, Prl-RP reduced time spent near a stranger in rats with low baseline anxiety, indicating heightened anxiety.

Conclusions:

• Intranasal administration of Prl-RP demonstrably increases anxiety levels in rats.
• The anxiogenic effect of Prl-RP is more pronounced in individuals with lower initial anxiety levels.